Question 1

In a collision that is inelastic,the total _________ after the collision is not the same as before the collision.

Accepted Answer

The answer of In a collision that is inelastic,the total...

Question 2

A rocket can never go faster than the speed of its exhaust.

Accepted Answer

A) True 
 B)False

Question 3

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.
-The power you supply to the crate is __________.

Accepted Answer

The answer of Consider a situation where you exert a...

Question 4

A ball is thrown straight upward with an initial speed of 30 m/s.Assuming there is no air resistance,how high does the ball go before falling back down?

Accepted Answer

The answer of A ball is thrown straight upward with...

Question 5

​Match each item with the correct statement below.​
-the mass of an object times its velocity

Accepted Answer

A) ​angular momentum 
B) ​elastic collision 
C) ​elastic potential energy 
D) ​energy 
E) ​gravitational potential energy
F)​heat
G)​inelastic collision
H)​kinetic energy
I)​lever
J)​linear momentum
K)​power
L)​work
M)​internal energy 
A) ​angular momentum 
B) ​elastic collision 
C) ​elastic potential energy 
D) ​energy 
E) ​gravitational potential energy
F)​heat
G)​inelastic collision
H)​kinetic energy
I)​lever
J)​linear momentum
K)​power
L)​work
M)​internal energy

Question 6

Linear momentum is conserved in all collisions.

Accepted Answer

A) True 
 B)False

Question 7

If a force on an object is aimed perpendicular to the direction of the object's velocity,the force does

Accepted Answer

A) no work. 
B) positive work. 
C) negative work. 
D) any of the above. 
A) no work. 
B) positive work. 
C) negative work. 
D) any of the above.

Question 8

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
-Angular momentum

Accepted Answer

A) is definitely conserved. 
B) is definitely not conserved. 
C) may or may not be conserved. 
D) none of the above 
A) is definitely conserved. 
B) is definitely not conserved. 
C) may or may not be conserved. 
D) none of the above

Question 9

Consider a situation where two moving objects collide, stick to each other, and move off together.
-Linear momentum is definitely conserved.

Accepted Answer

A) True 
 B)False

Question 10

About how many 100-W light bulbs would you have to light up to use energy at the rate of one horsepower?

Accepted Answer

A) one or two 
B) seven or eight 
C) the question doesn't make sense-hp and W are unrelated 
D) dozens 
E) none of the above 
A) one or two 
B) seven or eight 
C) the question doesn't make sense-hp and W are unrelated 
D) dozens 
E) none of the above

Question 11

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.
-You drop the box.As it falls to its original level,its kinetic energy is __________.

Accepted Answer

The answer of Consider a situation where you carry a...

Question 12

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
-Kinetic energy is conserved.

Accepted Answer

A) True 
 B)False

Question 13

Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.
-What is the impulse provided by the force?

Accepted Answer

A) 150 N-s 
B) 50 N-s 
C) 75 N-s 
D) undetermined-not enough information given 
E) none of the above 
A) 150 N-s 
B) 50 N-s 
C) 75 N-s 
D) undetermined-not enough information given 
E) none of the above

Question 14

The energy of a ball rolling up an inclined plane

Accepted Answer

A) is entirely kinetic. 
B) is entirely potential. 
C) is both kinetic and potential. 
D) none of the above 
A) is entirely kinetic. 
B) is entirely potential. 
C) is both kinetic and potential. 
D) none of the above

Question 15

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
-Angular momentum is conserved.

Accepted Answer

A) True 
 B)False

Question 16

A railroad car with a mass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg.The cars latch together and move off with a speed of 1.2 m/s.How fast was the first car moving before the collision?

Accepted Answer

The answer of A railroad car with a mass of...

Question 17

The mass of 1 m3 of fresh water is 1,000 kg.At the top of a hydroelectric dam the potential energy of the water is

Accepted Answer

A) 1,000 N. 
B) 9,800 N. 
C) 500 N. 
D) There is not enough information to calculate the potential energy. 
A) 1,000 N. 
B) 9,800 N. 
C) 500 N. 
D) There is not enough information to calculate the potential energy.

Question 18

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.
-He slides part way down the hill to a point where his gravitational potential energy is 200 J.His kinetic energy at that point will be

Accepted Answer

A) 200 J. 
B) 300 J. 
C) some unknown value between 0 and 500 J. 
D) none of the above. 
A) 200 J. 
B) 300 J. 
C) some unknown value between 0 and 500 J. 
D) none of the above.

Question 19

A barbell is easier to twist when its weights are

Accepted Answer

A) close to the axis of rotation. 
B) near the ends of the bar. 
C) heavy. 
D) light. 
E) none of the above. 
A) close to the axis of rotation. 
B) near the ends of the bar. 
C) heavy. 
D) light. 
E) none of the above.

Question 20

A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 N.The work done on the hammer as it falls is

Accepted Answer

A) 4.45 N-m. 
B) 44.5 N-m. 
C) 445 N-m. 
D) 4,450 N-m. 
A) 4.45 N-m. 
B) 44.5 N-m. 
C) 445 N-m. 
D) 4,450 N-m.

In a collision that is inelastic,the total _________ after the collision is not the same as before the collision.

A rocket can never go faster than the speed of its exhaust.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The power you supply to the crate is __________.

A ball is thrown straight upward with an initial speed of 30 m/s.Assuming there is no air resistance,how high does the ball go before falling back down?

Match each item with the correct statement below. -the mass of an object times its velocity

Linear momentum is conserved in all collisions.

If a force on an object is aimed perpendicular to the direction of the object's velocity,the force does

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Angular momentum

Consider a situation where two moving objects collide, stick to each other, and move off together. -Linear momentum is definitely conserved.

About how many 100-W light bulbs would you have to light up to use energy at the rate of one horsepower?

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -You drop the box.As it falls to its original level,its kinetic energy is __________.

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Kinetic energy is conserved.

Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds. -What is the impulse provided by the force?

The energy of a ball rolling up an inclined plane

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Angular momentum is conserved.

A railroad car with a mass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg.The cars latch together and move off with a speed of 1.2 m/s.How fast was the first car moving before the collision?

The mass of 1 m³ of fresh water is 1,000 kg.At the top of a hydroelectric dam the potential energy of the water is

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. -He slides part way down the hill to a point where his gravitational potential energy is 200 J.His kinetic energy at that point will be

A barbell is easier to twist when its weights are

A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 N.The work done on the hammer as it falls is

The Study of Motion

Newtons Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Electromagnetism and Em Waves

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

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Exam 3: Energy and Conservation Laws

In a collision that is inelastic,the total _________ after the collision is not the same as before the collision.

A rocket can never go faster than the speed of its exhaust.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The power you supply to the crate is __________.

A ball is thrown straight upward with an initial speed of 30 m/s.Assuming there is no air resistance,how high does the ball go before falling back down?

​Match each item with the correct statement below.​ -the mass of an object times its velocity

Linear momentum is conserved in all collisions.

If a force on an object is aimed perpendicular to the direction of the object's velocity,the force does

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Angular momentum

Consider a situation where two moving objects collide, stick to each other, and move off together. -Linear momentum is definitely conserved.

About how many 100-W light bulbs would you have to light up to use energy at the rate of one horsepower?

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -You drop the box.As it falls to its original level,its kinetic energy is __________.

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Kinetic energy is conserved.

Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds. -What is the impulse provided by the force?

The energy of a ball rolling up an inclined plane

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Angular momentum is conserved.

A railroad car with a mass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg.The cars latch together and move off with a speed of 1.2 m/s.How fast was the first car moving before the collision?

The mass of 1 m3 of fresh water is 1,000 kg.At the top of a hydroelectric dam the potential energy of the water is

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. -He slides part way down the hill to a point where his gravitational potential energy is 200 J.His kinetic energy at that point will be

A barbell is easier to twist when its weights are

A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 N.The work done on the hammer as it falls is

The Study of Motion

Newtons Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Electromagnetism and Em Waves

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

Filters

Match each item with the correct statement below. -the mass of an object times its velocity

The mass of 1 m³ of fresh water is 1,000 kg.At the top of a hydroelectric dam the potential energy of the water is